Physical and chemical changes occur all around us. These changes are essential parts of our daily lives. However a few of the physical and chemical changes that occur daily are harmful to the environment. For example 

1. Plastic decomposition, global warming, effects of acid rain and oil spills, earthquakes, floods etc. 

2. Plastic waste is a widely recognised source of pollution. Most plastics are nonbiodegradable. They take hundreds of years to decompose. Hence their disposal causes pollution. 

3. Global warming is due to drastic increase in the emission of carbon dioxide by the burning of fossil fuels. The climate change affects not only the atmosphere and living things on land but also creatures of ocean. 

4. Acidic gases are produced when fossil fuels such as coal and oil are burned in power station, factories and homes. 

5. Oil spills occur when liquid petroleum is released into the environment by human interference causing damage to creatures of ocean. 

6. Changes are quite common in nature. Human beings are misusing the natural re-sources for their needs. 

7. But we should take care that our needs should not bring drastic changes that causes harm to the nature and mankind.